kechkfault infected with signal 12 while launching Sybase 12.5.4

I am having troubles accessing my Sybase 12.5.4 instance on Solaris 9 because when I launch it, I get the following log:

00:00000:00001:2016/06/02 11:37:54.32 server  Database 'master' is now online.
00:00000:00000:2016/06/02 11:37:54.33 kernel  Current process (0x40004) infected with signal 12 (SIGSYS)
00:00000:00000:2016/06/02 11:37:54.33 kernel  Address 0xff3dc0dc (), siginfo (code, address) = (-1, 0x00001e27)
00:00000:00000:2016/06/02 11:37:54.33 kernel  kechkfault: engine 0: scheduler infected with signal 12 (SIGSYS)
00:00000:00000:2016/06/02 11:37:54.33 kernel  pc: 0x00910c98 pcstkwalk+0x24(0xfc746c80, 0xfc74663c, 0x0144c800, 0x00000002, 0x00000000)
00:00000:00000:2016/06/02 11:37:54.33 kernel  pc: 0x00910b74 ucstkgentrace+0x1ac(0x00040004, 0x00000002, 0x0000270f, 0x00000000, 0x00000000)
00:00000:00000:2016/06/02 11:37:54.33 kernel  pc: 0x0089cee4 ucbacktrace+0xac(0x00000000, 0x00000001, 0xfc746fa0, 0x00000001, 0x00000000)
00:00000:00000:2016/06/02 11:37:54.33 kernel  pc: 0x008b5bb4 keipanic+0x5c(0x0000c378, 0x00000000, 0x0000000c, 0x013b0a24, 0x00000000)
00:00000:00000:2016/06/02 11:37:54.33 kernel  pc: 0x008cee7c kisignal+0x1d8(0x01452000, 0xfc747838, 0xfc747580, 0x00000000, 0x00016928)
00:00000:00000:2016/06/02 11:37:54.33 kernel  pc: 0xff0256c8 __sighndlr+0xc(0x0000000c, 0xfc747838, 0xfc747580, 0x008ceca4, 0x00016928)
00:00000:00000:2016/06/02 11:37:54.33 kernel  pc: 0xff01f320 call_user_handler+0x234(0x0000000c, 0xfc747838, 0xfc747580, 0x00000030, 0x00000027)
00:00000:00000:2016/06/02 11:37:54.34 kernel  pc: 0xff01f4d0 sigacthandler+0x64(0x0000000c, 0xfc747838, 0xfc747580, 0x00000000, 0x00000000)
00:00000:00000:2016/06/02 11:37:54.34 kernel  pc: 0xff3d8ab8 (0xfc747980, 0x000000a3, 0x00000001, 0x0000000c, 0x0001555c)
00:00000:00000:2016/06/02 11:37:54.34 kernel  pc: 0xff3d33c0 (0xff05b848, 0xff05a5e4, 0x00000000, 0xff05a000, 0x00000000)
00:00000:00000:2016/06/02 11:37:54.34 kernel  pc: 0xff3dc03c (0xff05b848, 0xff05a5e4, 0x00000000, 0xff05a000, 0x00000000)
00:00000:00000:2016/06/02 11:37:54.34 kernel  pc: 0xff043e8c _aio_unlock+0x38(0x00000000, 0xffffffff, 0x00000001, 0x00000000, 0x00000000)
00:00000:00000:2016/06/02 11:37:54.34 kernel  pc: 0xff0424a8 aiowait+0x104(0x00f419fc, 0x00000000, 0x00000000, 0x00000000, 0x00000000)
00:00000:00000:2016/06/02 11:37:54.34 kernel  pc: 0x008a6220 kaio__dpoll+0x64(0x01452000, 0xfc7476e0, 0x00000000, 0xfc746d10, 0x00000000)
00:00000:00000:2016/06/02 11:37:54.34 kernel  pc: 0x008a90c8 dcheck+0xe4(0x00deb400, 0x00000000, 0x01452000, 0x00000000, 0x00000000)
00:00000:00000:2016/06/02 11:37:54.34 kernel  pc: 0x00905630 kpcheckio+0x550(0x01452000, 0x00f42400, 0x00000000, 0x00000000, 0x00000001)
00:00000:00000:2016/06/02 11:37:54.34 kernel  pc: 0x00903ca0 kpsched+0xaa0(0x00deb400, 0x01454800, 0x00000000, 0x00000000, 0x00000000)
00:00000:00000:2016/06/02 11:37:54.34 kernel  pc: 0x00926f74 _coldstart(0x00000000, 0x00903200, 0x00000000, 0x00000000, 0x00000000)
00:00000:00000:2016/06/02 11:37:54.34 kernel  end of stack trace, kernel service process: kpid 262148
00:00000:00000:2016/06/02 11:37:54.34 kernel  ueshutdown: exiting
00:00000:00000:2016/06/02 11:37:54.34 kernel  RTDS Server is already down.
00:00000:00000:2016/06/02 11:37:54.34 kernel  Abnormal exit detected - SQL Server process level execution bindings will be cleared on startup.

I guess then it is not completely launched cause I see it in the running processes but when I tried to connect to it with isql I get the following message:

CT-LIBRARY error:
        ct_connect(): network packet layer: internal net library error: Net-Lib protocol driver call to connect two endpoints failed

Any idea ? Thank you for your help.

Regards

This indicates some kind of a bug in ASE. You should contact Techsupport, either to see which newer version you could use that has the bug fixed, or whether there are any configuration settings that could avoid this from occurring.